Where is the start lock out that allows automatic B4000 to only start in park or neutral located

Just replaced the dash cluster lights in my 1994 B4000 Automatic 4wd truck and now I cannot start it! All seems hooked up but no start on ignition. I know there is a lock out for only starting in park and neutral but cannot find the mechanism or wire...HELP!

94 b4000 v6- idles at 200-500 rpm at start up. usually will kick in after about 1 minute. had one occasion where it stalled and wouldn't start, but may have been flooded. Check engine comes on mometar...

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